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import { Sequelize } from 'sequelize-typescript'
type SortType = { sortModel: any, sortValue: string }
// Translate for example "-name" to [ [ 'name', 'DESC' ], [ 'id', 'ASC' ] ]
function getSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
let { direction, field } = buildDirectionAndField(value)
if (field.toLowerCase() === 'match') { // Search
field = Sequelize.col('similarity')
}
return [ [ field, direction ], lastSort ]
}
function getVideoSort (value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
let { direction, field } = buildDirectionAndField(value)
// Alias
if (field.toLowerCase() === 'match') { // Search
field = Sequelize.col('similarity')
} else if (field.toLowerCase() === 'trending') { // Sort by aggregation
return [
[ Sequelize.fn('COALESCE', Sequelize.fn('SUM', Sequelize.col('VideoViews.views')), '0'), direction ],
[ Sequelize.col('VideoModel.views'), direction ],
lastSort
]
}
return [ [ field, direction ], lastSort ]
}
function getSortOnModel (model: any, value: string, lastSort: string[] = [ 'id', 'ASC' ]) {
let [ firstSort ] = getSort(value)
if (model) return [ [ model, firstSort[0], firstSort[1] ], lastSort ]
return [ firstSort, lastSort ]
}
function throwIfNotValid (value: any, validator: (value: any) => boolean, fieldName = 'value') {
if (validator(value) === false) {
throw new Error(`"${value}" is not a valid ${fieldName}.`)
}
}
function buildTrigramSearchIndex (indexName: string, attribute: string) {
return {
name: indexName,
fields: [ Sequelize.literal('lower(immutable_unaccent(' + attribute + '))') as any ],
using: 'gin',
operator: 'gin_trgm_ops'
}
}
function createSimilarityAttribute (col: string, value: string) {
return Sequelize.fn(
'similarity',
searchTrigramNormalizeCol(col),
searchTrigramNormalizeValue(value)
)
}
// ---------------------------------------------------------------------------
export {
SortType,
getSort,
getVideoSort,
getSortOnModel,
createSimilarityAttribute,
throwIfNotValid,
buildTrigramSearchIndex
}
// ---------------------------------------------------------------------------
function searchTrigramNormalizeValue (value: string) {
return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', value))
}
function searchTrigramNormalizeCol (col: string) {
return Sequelize.fn('lower', Sequelize.fn('immutable_unaccent', Sequelize.col(col)))
}
function buildDirectionAndField (value: string) {
let field: any
let direction: 'ASC' | 'DESC'
if (value.substring(0, 1) === '-') {
direction = 'DESC'
field = value.substring(1)
} else {
direction = 'ASC'
field = value
}
return { direction, field }
}
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